I have the same problem with my RX470.
It started with one of the Adrenalin Edition drivers. Don't remember the exact one. Every time I would plug in my TV per HDMI to use dual screen, windows would start to freeze for a second periodically. It was enough to only have the TV on standby to get this error. So if the graphics card gets any 'communication/contact' over the HDMI, the freezes will happen. It only stops when I unplug the HDMI cable or turn off the TV completely.
So I tried different older drivers until I got to the 17.5.2 version which worked for a while. Since some Win10 updates, this is no longer the case.
The only workaround I have so far is to uninstall all AMD drivers, reboot and let Win10 update get the graphics card drivers. For me, it's 17.1.1 and it works fine with two monitors. I have had no issues with any games I've played regarding the older driver.
I guess, that since one of the windows updates screwed the use of the 17.5.2 driver too, Win10 is one part of the problem...
1 of 1 people found this helpful
try comment #146 there
Thanks, disabling HDCP worked for me!
I went to Display in the Radeon Setting. Selected my TV, which is connected via HDMI, and clicked on 'Specs'.
Even though it said Disabled under 'Current HDCP Status' you need to go to 'Override' and select to disable 'HDCP Support' and restart.
After that, the freezes disappeared.
glad i could help